Type support

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Basic types

Fundamental types defined by the language

Additional basic types and convenience macros

Defined in header <stddef.h>
unsigned integer type returned by the sizeof operator
(typedef)
signed integer type returned when subtracting two pointers
(typedef)
implementation-defined null pointer constant
(macro constant)
a type with alignment requirement as great as any other scalar type
(typedef)
byte offset from the beginning of a struct type to specified member
(function macro)
Defined in header <stdalign.h>
alignas
(C11)
convenience macro, expands to keyword _Alignas
(macro constant)
alignof
(C11)
convenience macro, expands to keyword _Alignof
(macro constant)
__alignas_is_defined
(C11)
expands to integer constant 1
(macro constant)
__alignof_is_defined
(C11)
expands to integer constant 1
(macro constant)
Defined in header <stdnoreturn.h>
noreturn
(C11)
convenience macro, expands to _Noreturn
(macro constant)

Boolean type support (since C99)

Fixed width integer types (since C99)

Numeric limits

References

  • C11 standard (ISO/IEC 9899:2011):
  • 7.15 Alignment <stdalign.h> (p: 268)
  • 7.19 Common definitions <stddef.h> (p: 288)
  • 7.23 _Noreturn <stdnoreturn.h> (p: 361)
  • C99 standard (ISO/IEC 9899:1999):
  • 7.19 Common definitions <stddef.h> (p: 254)
  • C89/C90 standard (ISO/IEC 9899:1990):
  • 4.1.5 Common definitions <stddef.h>

See also

C++ documentation for Type support library